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Chapter 2. Java Language Security > Java Language Security Constructs
2.1. Java Language Security Constructs
In this chapter, we're going to be concerned primarily with how Java operates on things that are in memory on a particular machine. Within a Java program, every entity—that is, every object reference and every primitive data element—has an access level associated with it. To review, this access level may be:
private: The entity can only be accessed by code that is contained within the class that defines the entity.
Default (or package): The entity can be accessed by code that is contained within the class that defines the entity, or by a class that is contained in the same package as the class that defines the entity.
protected: The entity can only be accessed by code that is contained within the class that defines the entity, by classes within the same package as the defining class, or by a subclass of the defining class.
